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<title>omp_unset_nest_lock (GNU libgomp)</title>

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<span id="omp_005funset_005fnest_005flock"></span><div class="header">
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<span id="omp_005funset_005fnest_005flock-_002d_002d-Unset-nested-lock"></span><h3 class="section">3.45 <code>omp_unset_nest_lock</code> &ndash; Unset nested lock</h3>
<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p>A nested lock about to be unset must have been locked by <code>omp_set_nested_lock</code>
or <code>omp_test_nested_lock</code> before.  In addition, the lock must be held by the
thread calling <code>omp_unset_nested_lock</code>.  If the nesting count drops to zero, the
lock becomes unlocked.  If one ore more threads attempted to set the lock before,
one of them is chosen to, again, set the lock to itself.
</p>
</dd>
<dt><em>C/C++</em>:</dt>
<dd><table>
<tr><td width="20%"><em>Prototype</em>:</td><td width="80%"><code>void omp_unset_nest_lock(omp_nest_lock_t *lock);</code></td></tr>
</table>

</dd>
<dt><em>Fortran</em>:</dt>
<dd><table>
<tr><td width="20%"><em>Interface</em>:</td><td width="80%"><code>subroutine omp_unset_nest_lock(nvar)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code>integer(omp_nest_lock_kind), intent(inout) :: nvar</code></td></tr>
</table>

</dd>
<dt><em>See also</em>:</dt>
<dd><p><a href="omp_005fset_005fnest_005flock.html">omp_set_nest_lock</a>
</p>
</dd>
<dt><em>Reference</em>:</dt>
<dd><p><a href="https://www.openmp.org">OpenMP specification v4.5</a>, Section 3.3.5.
</p></dd>
</dl>






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